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  <title>2020年5月14日面试笔试题 | 永恒的金色年华</title>
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        <h5 id="Vue"><a href="#Vue" class="headerlink" title="Vue"></a>Vue</h5><h6 id="1-Vue常用指令及其作用"><a href="#1-Vue常用指令及其作用" class="headerlink" title="1.Vue常用指令及其作用"></a>1.Vue常用指令及其作用</h6><p>​    v-model     双向绑定指令</p>
<p>​    v-bind    绑定属性指令(语法糖写法”:”)</p>
<p>​    v-on    绑定事件指令(语法糖写法”@”)</p>
<p>​    v-show    控制隐藏和显示的指令，值是boolean</p>
<p>​    v-for    列表渲染指令(就是循环)</p>
<p>​    v-if v-else-if v-else    控制DOM删除的添加的指令，值是boolean</p>
<p>​    v-once    只渲染一次的指令</p>
<p>​    v-pre    跳过模板渲染的指令</p>
<p>​    v-cloak    解决花括号模板刷新时闪烁出现的问题</p>
<h6 id="2-Vue父子组件传值"><a href="#2-Vue父子组件传值" class="headerlink" title="2.Vue父子组件传值"></a>2.Vue父子组件传值</h6><p>父到子：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>在该父组件里的子组件里面v-bind父组件需要传的值，子组件使用prop来接收属性名，即可获取到传过来的值。</span><br><span class="line"></span><br><span class="line"><span class="number">2.</span>$parent在父组件里面使用，可直接获取到其父组件，并且父组件里面的值就可以获取的到。</span><br><span class="line"></span><br><span class="line"><span class="number">3.</span>使用provide和inject,</span><br><span class="line">provide为提供值的一方,例：</span><br><span class="line">    provide:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span> &#123;</span><br><span class="line">            apple:<span class="built_in">this</span>.title</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">inject为接收的一方</span><br><span class="line">	inject:[<span class="string">&#x27;apple&#x27;</span>]</span><br><span class="line">这样就接受到了其他组件传过来的值</span><br><span class="line"></span><br></pre></td></tr></table></figure>



<p>子到父：</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>在组件定义一个方法绑定到子组件的模板中去，方法里用<span class="built_in">this</span>.$emit(第一个参数，第二参数)，第一个参数为发送的方法键名在父组件中写为(@第一个参数)，键值为方法名，可在父组件的methods使用；第二个参数为发送的一些值，可在父组件中的键值方法中获取的到</span><br><span class="line"></span><br><span class="line"><span class="number">2.</span>$children在子组件里面使用，可直接获取到子组件的(为一个数组，使用下标获取到想要的子组件)，并且子组件里面的值就可以获取的到。</span><br><span class="line"></span><br><span class="line"><span class="number">3.</span>使用provide和inject,</span><br><span class="line">provide为提供值的一方,例：</span><br><span class="line">    provide:<span class="function"><span class="keyword">function</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">        <span class="keyword">return</span> &#123;</span><br><span class="line">            apple:<span class="built_in">this</span>.title</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">inject为接收的一方</span><br><span class="line">	inject:[<span class="string">&#x27;apple&#x27;</span>]</span><br><span class="line">这样就接受到了其他组件传过来的值</span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h6 id="3-Vue如何阻止事件冒泡"><a href="#3-Vue如何阻止事件冒泡" class="headerlink" title="3.Vue如何阻止事件冒泡"></a>3.Vue如何阻止事件冒泡</h6><p>比如@click.stop=””</p>
<h6 id="4-Vue生命周期"><a href="#4-Vue生命周期" class="headerlink" title="4.Vue生命周期"></a>4.Vue生命周期</h6><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br></pre></td><td class="code"><pre><span class="line">beforeCreate()</span><br><span class="line"></span><br><span class="line">	 在实例初始化之后，数据观测(data observer) 和 event&#x2F;watcher 事件配置之前被调用。 </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">created()</span><br><span class="line"></span><br><span class="line"> 	实例已经创建完成之后被调用。在这一步，实例已完成以下的配置：数据观测(data observer)，属性和方法的运算， watch&#x2F;event 事件回调。然而，挂载阶段还没开始，$el 属性目前不可见。 </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">beforeMount()</span><br><span class="line"></span><br><span class="line">	 在挂载开始之前被调用：相关的 render 函数首次被调用。 	</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">mounted()</span><br><span class="line"></span><br><span class="line">	 el 被新创建的 vm.$el 替换，并挂载到实例上去之后调用该钩子。如果 root 实例挂载了一个文档内元素，当 mounted 被调用时 vm.$el 也在文档内。 </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">beforeUpdate()</span><br><span class="line"></span><br><span class="line">	 数据更新时调用，发生在虚拟 DOM 重新渲染和打补丁之前。 你可以在这个钩子中进一步地更改状态，这不会触发附加的重渲染过程。 </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">updated()</span><br><span class="line"></span><br><span class="line">	由于数据更改导致的虚拟 DOM 重新渲染和打补丁，在这之后会调用该钩子。</span><br><span class="line"></span><br><span class="line">当这个钩子被调用时，组件 DOM 已经更新，所以你现在可以执行依赖于 DOM 的操作。然而在大多数情况下，你应该避免在此期间更改状态，因为这可能会导致更新无限循环。</span><br><span class="line"></span><br><span class="line">该钩子在服务器端渲染期间不被调用。</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">beforeDestroy()</span><br><span class="line"></span><br><span class="line">	 实例销毁之前调用。在这一步，实例仍然完全可用。 </span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">destroyed()</span><br><span class="line"></span><br><span class="line">	 Vue 实例销毁后调用。调用后，Vue 实例指示的所有东西都会解绑定，所有的事件监听器会被移除，所有的子实例也会被销毁。 该钩子在服务器端渲染期间不被调用。 </span><br><span class="line"></span><br></pre></td></tr></table></figure>

<h5 id="CSS"><a href="#CSS" class="headerlink" title="CSS"></a>CSS</h5><h6 id="1-css3的新特性"><a href="#1-css3的新特性" class="headerlink" title="1.css3的新特性"></a>1.css3的新特性</h6><figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br></pre></td><td class="code"><pre><span class="line">答:<span class="number">1.</span>css选择器(属性选择器和伪类选择器)</span><br><span class="line"></span><br><span class="line">   E[att^=<span class="string">&quot;val&quot;</span>]匹配具有att属性、且值以val开头的E元素</span><br><span class="line"></span><br><span class="line">　  E[att$=<span class="string">&quot;val&quot;</span>]匹配具有att属性、且值以val结尾的E元素</span><br><span class="line"></span><br><span class="line">　　E[att*=<span class="string">&quot;val&quot;</span>]匹配具有att属性、且值中含有val的E元素</span><br><span class="line"></span><br><span class="line">　　E:root匹配文档的根元素。在HTML中，根元素永远是HTML</span><br><span class="line"></span><br><span class="line">　　E:nth-child(n)匹配父元素中的第n个子元素E</span><br><span class="line"></span><br><span class="line">　　E:nth-last-child(n)匹配父元素中的倒数第n个结构子元素E</span><br><span class="line"></span><br><span class="line">　　E:nth-<span class="keyword">of</span>-type(n)匹配同类型中的第n个同级兄弟元素E</span><br><span class="line"></span><br><span class="line">　　E:nth-last-<span class="keyword">of</span>-type(n)匹配同类型中的倒数第n个同级兄弟元素E</span><br><span class="line"></span><br><span class="line">　　E:last-child匹配父元素中最后一个E元素</span><br><span class="line"></span><br><span class="line">　　E:first-<span class="keyword">of</span>-type匹配同级兄弟元素中的第一个E元素</span><br><span class="line"></span><br><span class="line">　　E:only-child匹配属于父元素中唯一子元素的E</span><br><span class="line">	</span><br><span class="line">　　E:only-<span class="keyword">of</span>-type匹配属于同类型中唯一兄弟元素的E</span><br><span class="line">	</span><br><span class="line">　　E:empty匹配没有任何子元素（包括text节点）的元素E</span><br><span class="line"></span><br><span class="line">　　:target匹配相关URL指向的E元素</span><br><span class="line"></span><br><span class="line">　　E:enabled匹配所有用户界面（form表单）中处于可用状态的E元素</span><br><span class="line"></span><br><span class="line">　　E:disabled匹配所有用户界面（form表单）中处于不可用状态的E元素</span><br><span class="line"></span><br><span class="line">　　E:checked匹配所有用户界面（form表单）中处于选中状态的元素E</span><br><span class="line"></span><br><span class="line">　　E::selection匹配E元素中被用户选中或处于高亮状态的部分</span><br><span class="line"></span><br><span class="line">　　E:not(s)匹配所有不匹配简单选择符s的元素E</span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> <span class="number">2.</span>css样式特效部分：</span><br><span class="line"> 圆角：border-radius: 参数一(圆角半径单位可以是字体大小的所有单位)</span><br><span class="line"> </span><br><span class="line"> 盒子阴影:box-shadow:<span class="number">0</span> <span class="number">0</span> 2px 2px #fff inset; 阴影上下偏移距离 阴影左右偏移距离 阴影宽度 阴影模糊程度 颜色 inset表示阴影在内部</span><br><span class="line"> </span><br><span class="line"> 文字阴影:text-shadow</span><br><span class="line"> </span><br><span class="line"> 颜色渐变:backgrount: linear-gradient(直线渐变) radial-gradient径向渐变</span><br><span class="line"> </span><br><span class="line"> background：rgba()颜色属性</span><br><span class="line"> </span><br><span class="line"> 边框图像：border-image</span><br><span class="line"> </span><br><span class="line"> 滤镜：filter:rayscale(<span class="number">100</span>%)、褐色filter:sepia(<span class="number">1</span>)、饱和度saturate(<span class="number">2</span>)、色相旋转hue-rotate(90deg) 模糊blur(3px)</span><br><span class="line"> </span><br><span class="line"> 透明度:opacity:<span class="number">0.5</span></span><br><span class="line"> </span><br><span class="line"> </span><br><span class="line"> <span class="number">3.</span>css高级部分</span><br><span class="line"> </span><br><span class="line"> transform：</span><br><span class="line"> 	rotate 旋转(rotateX,rotateY,rotateZ)以下三个都有X/Y/Z</span><br><span class="line"> 	scale 缩放</span><br><span class="line"> 	translate 平移</span><br><span class="line"> 	</span><br><span class="line"> transform-origin 中心点调整</span><br><span class="line"> </span><br><span class="line"> transition: 过渡</span><br><span class="line"> 	transition-property 需要过度的属性</span><br><span class="line"> 	transition-duration 过渡的总时间</span><br><span class="line"> 	transition-timing-<span class="function"><span class="keyword">function</span> 过渡的时间曲线</span></span><br><span class="line"><span class="function"> 	<span class="title">transition</span>-<span class="title">delay</span> 过渡的延迟发生时间</span></span><br><span class="line"><span class="function"> 	<span class="title">matrix</span> 矩阵参数</span></span><br><span class="line"><span class="function"> </span></span><br><span class="line"><span class="function"> <span class="title">animation</span>：动画</span></span><br><span class="line"><span class="function">   <span class="title">animation</span>-<span class="title">name</span> 动画名称</span></span><br><span class="line"><span class="function">　　<span class="title">animation</span>-<span class="title">duration</span> 动画总时间</span></span><br><span class="line"><span class="function">　　<span class="title">animation</span>-<span class="title">timing</span>-<span class="function"><span class="keyword">function</span> 动画时间曲线</span></span></span><br><span class="line"><span class="function"><span class="function">　　<span class="title">animation</span>-<span class="title">delay</span> 动画延迟时间</span></span></span><br><span class="line"><span class="function"><span class="function">　　<span class="title">animation</span>-<span class="title">iteration</span>-<span class="title">count</span> 动画播放方式(<span class="params">重复还是一次</span>)</span></span></span><br><span class="line"><span class="function"><span class="function">　　<span class="title">animation</span>-<span class="title">direction</span> 动画播放是否来回播放(<span class="params">方向</span>)</span></span></span><br><span class="line"><span class="function"><span class="function">　　<span class="title">animation</span>-<span class="title">fill</span>-<span class="title">mode</span> 动画天从模式<span class="title">none</span>(<span class="params">正常</span>)|<span class="title">forwards</span>(<span class="params">在动画初始位置停止</span>)|<span class="title">backwards</span>(<span class="params">动画在最后位置停止</span>)|<span class="title">both</span>(<span class="params">都有</span>)</span>;</span></span><br><span class="line"><span class="function">　　</span></span><br><span class="line"><span class="function">　　@<span class="title">keyframe</span> 动画名称</span>&#123;</span><br><span class="line">　　	<span class="number">0</span>%&#123;</span><br><span class="line">　　	</span><br><span class="line">　　	&#125;</span><br><span class="line">　　	<span class="number">100</span>%&#123;</span><br><span class="line">　　	</span><br><span class="line">　　	&#125;</span><br><span class="line">　　&#125;</span><br><span class="line">　</span><br><span class="line"> <span class="number">4.</span>盒子反射box-reflect方向[ above-上 | below-下 | right-右 | left-左 ]，偏移量，遮罩图片</span><br><span class="line"> <span class="number">5.</span>弹性布局：flex见菜鸟教程官方文档教程 https:<span class="comment">//www.runoob.com/css3/css3-flexbox.html</span></span><br><span class="line">   栅格布局：gird</span><br><span class="line"> <span class="number">6.</span>媒体查询:@media () &#123;</span><br><span class="line">     </span><br><span class="line"> 			&#125;</span><br></pre></td></tr></table></figure>



<h5 id="js"><a href="#js" class="headerlink" title="js"></a>js</h5><p>​    1.关于promise输出的先后顺序的题目</p>
<p>​    2.关于定义变量作用域和变量命名(用输出的先后顺序和输出结果来做题目)</p>
<p>​    3.for( var i=0;i&lt;5;i++ ){</p>
<p>​        if( i=3 ) continue</p>
<p>​        console.log(i)</p>
<p>​    } 输出什么</p>
<p>​    </p>
<h5 id="小程序"><a href="#小程序" class="headerlink" title="小程序"></a>小程序</h5><p>​    1.bindTap和catchTap的区别</p>
<p>​        答：bindtap绑定事件会冒泡到父级元素上面，catchTap不会</p>

      
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